Operating Results of the BGL Gasifier at Schwarze Pumpe GmbH An Allied Technologies Group company...

EN VIROTHERM Gm bHAn Allied Technologies Group company

Operating Results of the BGL Gasifier at Schwarze Pumpe

Dr. Hans-Joachim Sander SVZDr. Georg Daradimos EnvirothermHansjobst Hirschfelder Envirotherm

Gasification Technologies 2003

San Francisco, California

October 12-15, 2003


The location of SVZ


Plant overview


Gasification

Building


Merging of the BGL and the SVZ TechnologyScotland Schwarze Pumpe

BGL Development + Demonstration

BGL / SVZ Pre-feasibility + Conceptual phase

BGL Design +

Construction

syn- + fuel gasproduction from coal + biomass +

wastes for electric powergeneration +

methanol synthesis

TowngasProduction

From lignite

BGL Demonstration

THERMIESupportobtained

EU support

Support from

Saxony, FRG


Simplified SVZ Plant ConfigurationSolid Wastes (300.000 tpy)

Liquid Wastes

Grate Gasifier (7)

Entrained-flow Gasification (2)

Partial CO-Shift

Conditioning

Gas Purification

Methanol Synthesis

Methanol Distillation

Gas TurbinePG 6551 B

HRSG

Steam Turbine

FGD

Preparation

Coal

~steam/oxygen

BGL Gasifier (1)

Sour Gas GypsumSteam

Purge Gas45 MWel

District Heat

30 MWel ~Methanol, Grade AA (120.000 tpy)


The British Gas/Lurgi Gasifier “BGL”


BGL Gasifier Dimensions

Overall Dimensions

inside diameter 12 ft

outside diameter 16 ft

height approx. 41 ft

scale up 2.5 (cross section)

170 ft

0 ft

60 ft


Westfield BGL / SVZ BGL - Comparison

Westfield BGL SVZ BGL1975 – 1985 1985 – 1991 since 2000

(ESG)

Diameter 6 ft 8 ft 12 ft

Feedstock bituminous coal hard coal waste and coal

Bed Height 13 ft 20 ft 20 ft (operating at 10-14 ft)

Fuel feeding system coal lock coal lock additional fuel locks (2)

Coal distributor yes (cooled) yes (ccoled) no

Coal stirrer yes (cooled) yes (cooled) nothree arms 5 arms

Brick lining reactor vessel reactor vessel 100% reactor vessel(up to coal distributor) (50% of height)

Gas offtake temperature 1000 °F 750 °F 1000 °F (coal)1450 °F (waste)


Feedstock

Waste / Coal Mixtures treated and gasified at SVZ

Typical Current

Range Operation

(% by weight)

RDF-Pellets 30 - 50 20 25 30

Agglomerated Plastic Waste 20 - 30 30 45 45

Compacted Shredder Light Fraction 8 - - -

Briquetted Industrial Sludge 5 - 10

Briquetted Sewage Sludge 5 - 15

Shredded Wood Waste 0 - 10 - - -

Hard Coal/Lignite 20 - 25 19/6 12.5/7.5 12.5/7.5

25 10 5


RDF-pellets


Agglomerated Plastic Waste


Shredded Wood Waste


Comparison between expected and achieved basis of design

0

20

40

60

80

100

120

140

Throughput Consumption Consumption Consumption Consumption

PercentagePercentage

(waste and coal) Oxygen

100% = basis of design

Steam Electricity Nat-Gas


Slag Quality

Leaching properties as per highest German rating are met

DC11) DC21)

Loss of Ignition (%) < 1,3 ≤ 3 ≤ 5

TOC (mg/ltr) < 0,7 < 1 < 3

Extractible

Lipophil matters (mg/ltr) < 0,2 ≤ 0,4 ≤ 0,8

1) Disposal class acc. to German “TA-Siedlungsabfall” (DC1 is highest rating)


Extended Test Runs at SVZ with Petcoke/Coal only

petcoke blackcoal

Crude gas mN3/hr 31,000 33,000

(limited by oxygen available)

Oxygen consumption mN3O2/mN

3 crude 0.2 0.2

Steam/Oxygen ratio kg/kg 0.7 0.7

Coal (ar) metric ton/hr 19.5 20.4

CO2 (%) 1.0 4.4 (3.0 – 6.9)

CO (%) 59 56 (52 – 60)

Raw gas outlet temp. (°C) 580 550


Typical Gasifier Performance Based on 100% Coal Operation

Feed 81,000 lbs/hr (ar)

68,000 lbs/hr (daf)

Typical Coal Analysis (%)

C 83H 6O 6N 2S 3

C Fix 47Volatiles 36Moisture 6Ash 11

Typical Crude Gas Analysis (%)

CO2 4CO 56H2 28N2 3CH4 7Others 2

Typical Module Size 140 MWel

Crude Gas54 mil. scf/d

Slag 9,000 lbs/hr


Concluding Remarks to BGL-Gasification

• low specific consumption of oxygen and steam

• high throughput / high efficiency

• co-gasification of coal and waste possible and demonstrated

• successfully demonstrated in the SVZ for the combination of power and methanol production

• proven reliability

• viable solution

• commercially available, for gasification of coal

Envirotherm offers this process for commercial application


Thank you very much for your kind attention!

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Operating Results of the BGL Gasifier at Schwarze Pumpe GmbH An Allied Technologies Group company...

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